"json body cannot be decoded: EOF" after trying to read the request body

In PHP development, we often encounter various problems and errors. One of the common problems is the "json body cannot be decoded: EOF" error when trying to read the request body. This error means that an unexpected end-of-file was encountered while decoding the JSON request body. Typically, this issue can be resolved with some simple debugging and troubleshooting. In this article, we will discuss the possible causes of this issue and provide some solutions to help you resolve this error.

Question content

I wrote a logger middleware that stores incoming graphql request information. The problem is that if I try to read the request body, I get the following 400 bad request:

{
    "errors": [
        {
            "message": "json body could not be decoded: eof"
        }
    ],
    "data": null
}

My code:

clonedReq := r.Clone(ctx)
data, _ := io.ReadAll(clonedReq.Body)

// store the data...
fmt.Println(string(data))

The data is displayed, but then I get an eof error. If I comment out this part, the request gets responded without any issues.

The problem remains whether or not clone is used to request a deep copy.

Solution

The middleware reads the request body to eof. Handler encountered eof. The contents of the request body are not cloned in clone().

To fix the code, restore the request body in the middleware:

data, _ := io.ReadAll(r.Body)
  r.Body = io.NopCloser(bytes.NewReader(data))

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